scholarly journals Green emission carbon quantum dots from lemon juice for selective detection of Fe3+ ions

2019 ◽  
Vol 35 (1) ◽  
Author(s):  
Vuong Pham Hung
Keyword(s):  
Quantum Dots ◽  
Green Light ◽  
Green Emission ◽  
Carbon Quantum Dots ◽  
Lemon Juice ◽  
X Ray Diffraction ◽  
High Resolution Tem ◽  
Sensitivity And Selectivity ◽  
Bright Green ◽  
Xrd Techniques

        In this article carbon quantum dots (Cdots) were prepared by a facile, green, economical hydrothermal method of the mixed deionized water and lemon juice. Optical and structural properties of the Cdots have been extensively studied by UV–visible and fluorescence spectroscopy, x-ray diffraction (XRD) techniques, and high resolution TEM (HR-TEM). Surface functionality of Cdots has been illustrated by Fourier transform infrared spectroscopy (FTIR). The fabricated Cdots emit bright green light with broad spectrum. The Cdots exhibit captivating sensitivity and selectivity toward Fe3+ with a linear range from 0 to 80 ppm and a detection limit of 38.08 ppm.

scholarly journals Synthesis of Nitrogen-Doped Lignin/DES Carbon Quantum Dots as a Fluorescent Probe for the Detection of Fe3+ Ions

Polymers ◽  
2018 ◽  
Vol 10 (11) ◽  
pp. 1282 ◽  
Author(s):  
Xueqin Jiang ◽  
Yixin Shi ◽  
Xin Liu ◽  
Meng Wang ◽  
Pingping Song ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Carbon Nanomaterials ◽  
Carbon Sources ◽  
Deep Eutectic Solvent ◽  
Carbon Quantum Dots ◽  
Iron Ions ◽  
Green Method ◽  
Nitrogen Doped ◽  
Potential Applications ◽  
Sensitivity And Selectivity

Carbon quantum dots (CQDs) as a rising star of carbon nanomaterials have extensive applications due to their excellent characteristics. In this work, we introduce a simple and green method to prepare nitrogen-doped lignin carbon quantum dots (N-L-CQDs) by using alkali lignin carbon sources and deep eutectic solvent (DES) as solution and nitrogen source. The physiochemical characterization results suggested that N-L-CQDs with diameters ranging from 4 to 12 nm were successfully synthesized. The optical properties data indicated that the as-prepared N-L-CQDs with a quantum yield of 7.95% exhibited excellent optoelectronic properties, excitation-dependent and pH stability. After that, we have investigated the N-L-CQDs used as fluorescent probes to detect iron ions, which suggested that the as-prepared N-L-CQDs exhibited excellent sensitivity and selectivity for Fe3+ with a detection limit of 0.44 μM. Besides, cytotoxicity of N-L-CQDs was also evaluated by MTT assay. These results demonstrated that the as-prepared N-L-CQDs with excellent properties have potential applications in environment and biomedicine.

The Luminescence Properties of BaGd2(MoO4)4: Eu3+, Er3+, Yb3+ Phosphors

2010 ◽  
Vol 663-665 ◽  
pp. 137-140 ◽  
Author(s):  
Jia Yue Sun ◽  
Wei Hang Zhang ◽  
Yu Jing Lan ◽  
Hai Yan Du
Keyword(s):  
Red Light ◽  
Green Light ◽  
Green Emission ◽  
Infrared Light ◽  
Solid State Method ◽  
Light Excitation ◽  
Bright Green ◽  
State Method ◽  
Uv Excitation ◽  
Color Emission

Two-color emission phosphors BaGd2(MoO4)4: Eu3+, Er3+, Yb3+ have been synthesized by the high temperature solid-state method. The as-prepared BaGd2(MoO4)4: Eu3+, Er3+, Yb3+ phosphors can emit intense red light under 395 nm UV excitation, while it will show bright green light upon 980 nm infrared light excitation. It is found that the red emission peaks at 595 and 614 nm should be attributed to 5D0-7F1 and 5D0-7F2 transitions of Eu3+, respectively. The green emission peaks centered at 532 and 553 nm under 980 nm excitation, are attributed to Er3+ transitions from 4H11/2 -4I15/2 and 4S3/2-4I15/2, respectively.

scholarly journals GRAPHENE QUANTUM DOTS AS A REDUCING REAGENT AND STABILIZER FOR GREEN SYNTHESIS OF SILVER NANOPARTICLES: TOWARDS A HYDROGEN PEROXIDE AND GLUCOSE SENSOR

2018 ◽  
Vol 56 (1A) ◽  
pp. 146 ◽  
Author(s):  
Tran Vinh Hoang
Keyword(s):  
Hydrogen Peroxide ◽  
Quantum Dots ◽  
Silver Nanoparticles ◽  
Glucose Sensor ◽  
Graphene Quantum Dots ◽  
X Ray Diffraction ◽  
Simple Method ◽  
Transmission Electron ◽  
Sensitivity And Selectivity ◽  
Signal Probe

In this work, we have developed a simple method for preparation of silver nanoparticles/graphene quantum dots hybrid (AgNPs/GQDs) using graphene quantum dots (GQDs) as reducing reagent and stabilizer. The synthesized GQDs and AgNPs/GQDs hybrid have been characterized by ultraviolet–visible spectroscopy (UV-Vis), photoluminescence (PL), X-ray diffraction (XRD) and transmission electron microscopy (TEM). Results indicated that mono-dispersed AgNPs were obtained with particles size around 30 nm. Based on the etching of silver nanoparticles by hydrogen peroxide (H2O2), we have constructed a colorimetric sensor for H2O2 and glucose sensors basing on the use of AgNPs/GQDs hybrid as capture probe and signal probe. The fabricated sensors performed excellent sensitivity and selectivity, high reproducibility for H2O2 and glucose detection with a low detection limit of 100 nM and 0.1 mM for hydrogen peroxide and glucose, respectively.

scholarly journals Hydrothermal synthesis of nitrogen and boron doped carbon quantum dots with yellow-green emission for sensing Cr(vi), anti-counterfeiting and cell imaging

RSC Advances ◽  
2017 ◽  
Vol 7 (76) ◽  
pp. 48386-48393 ◽  
Author(s):  
Yongming Guo ◽  
Yuzhi Chen ◽  
Fengpu Cao ◽  
Lijuan Wang ◽  
Zhuo Wang ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Hydrothermal Synthesis ◽  
Hydrothermal Method ◽  
Cell Imaging ◽  
Green Emission ◽  
Carbon Quantum Dots ◽  
Fluorometric Detection ◽  
Great Stability ◽  
Boron Doped ◽  
Co Doped

Nitrogen and boron co-doped carbon quantum dots with great stability in high-salt conditions and good photostability are prepared through hydrothermal method and utilized for fluorometric detection of Cr(vi), anti-counterfeiting and cell imaging.

Facile Preparation of Boron and Nitrogen Codoped Green Emission Carbon Quantum Dots for Detection of Permanganate and Captopril

2019 ◽  
Vol 91 (17) ◽  
pp. 11455-11460 ◽  
Author(s):  
Xiaohua Jiang ◽  
Dongmiao Qin ◽  
Guichun Mo ◽  
Jinsu Feng ◽  
Xiangfei Zheng ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Green Emission ◽  
Carbon Quantum Dots ◽  
Facile Preparation

scholarly journals Green Synthesis of Highly Luminescent Carbon Quantum Dots from Lemon Juice

2019 ◽  
Vol 2019 ◽  
pp. 1-9 ◽  
Author(s):  
Bui Thi Hoan ◽  
Phuong Dinh Tam ◽  
Vuong-Hung Pham
Keyword(s):  
Photoelectron Spectroscopy ◽  
Light Emission ◽  
Green Light ◽  
Carbon Quantum Dots ◽  
Lemon Juice ◽  
One Pot ◽  
Transmission Electron ◽  
Green Light Emission ◽  
Different Temperatures ◽  
The One

Highly luminescent carbon dots (C-dots) were synthesized by the one-pot simple hydrothermal method directly from lemon juice using different temperatures, time, aging of precursors, and diluted solvents to control the luminescence of C‐dots. The obtained C-dots were characterized by high-resolution transmission electron microscopy, X-ray photoelectron spectroscopy, Fourier transform infrared spectrophotometry, dynamic light scattering, ultraviolet-visible spectrophotometry, and photoluminescent spectrophotometry. The results show that C‐dots had strong green light emission with quantum yield in the range of 14.86 to 24.89% as a function of hydrothermal temperatures. Furthermore, light emission that is dependent on hydrothermal time, aging of precursor, and diluted solvent was observed. These results suggest that the C‐dots have potential application in optoelectronics and bioimaging.

scholarly journals Fluorescent-Nitrogen-Doped Carbon Quantum Dots Derived from Citrus Lemon Juice: Green Synthesis, Mercury(II) Ion Sensing, and Live Cell Imaging

ACS Omega ◽  
2020 ◽  
Vol 5 (8) ◽  
pp. 3889-3898 ◽  
Author(s):  
Aschalew Tadesse ◽  
Mebrahtu Hagos ◽  
Dharmasoth RamaDevi ◽  
Kaloth Basavaiah ◽  
Neway Belachew
Keyword(s):  
Quantum Dots ◽  
Green Synthesis ◽  
Live Cell Imaging ◽  
Cell Imaging ◽  
Carbon Quantum Dots ◽  
Lemon Juice ◽  
Live Cell ◽  
Nitrogen Doped ◽  
Ion Sensing ◽  
Nitrogen Doped Carbon

Highly luminescent N-doped carbon quantum dots from lemon juice with porphyrin-like structures surrounded by graphitic network for sensing applications

RSC Advances ◽  
2016 ◽  
Vol 6 (65) ◽  
pp. 59927-59934 ◽  
Author(s):  
Tapas Kumar Mondal ◽  
Abhisek Gupta ◽  
Bikash Kumar Shaw ◽  
Supriya Mondal ◽  
Uttam Kumar Ghorai ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Carbon Quantum Dots ◽  
Lemon Juice ◽  
Synthetic Approach ◽  
Selective Detection ◽  
Sensing Applications

Green synthetic approach to synthesizing highly luminescent N-doped carbon quantum dots with porphyrin like moiety for sensitive and selective detection of Fe3+.

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